Speed-changing device.



c. 0'. JoHNsnu.

SPEED CHANGING DEVISE.

(Applikation lad Mar. 23, 1901.)

(No Model.)

Patented Nov. 26, |90I.

3 Sheets-Sheet l,

DNENTGB.

No. 687,566. Patented Nov. 26, |90l.

C. 0.4J0HNS0N.

SPEED CHANGING DEVICE.

(Appucaticn med Mar. 2a, i901.) (No ModeL 3 Sheets-Sheet 2.

Wfrmasme 'l MNTQ M@ @2W @ww dw'/"ffw we Nonms Parzws co. PHcoLlmo. wAsmNcroN. n, c.

N0. 687,566. Patented Nov. 26, |90l c. o. JHNsoN.

SPEED CHANGING DEVIEE.

(Application led Mar. 23, 1901.) (No Model.)v 3 Sheets-Sheet 3.

UNITED STATES PATENT FFICE.

CHARLES O. JOHNSON, OFBOSTON, MASSACHUSETTS.

SPEED-CHANGING DEVICE.

SPECIFICATION forming part of Letters Patent N 0. 687,566, dated November 26, 1901.

Application filed March 23. 1901- Sen'al No. 52,572. (No model.)

T0 @ZZ whom t Wtcty concern.-

Be it known that I, CHARLES O. JOHNSON, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Speed-Changing Devices, of which the following is a specification.

This invention relates to improvements in speedchanging devices forl the purpose of changing the speed of a driven shaft from a continuously-rotating driver-shaft- The invention is carried out as follows, reference being had to the accompanying drawings, wherein- Figure l represents a top plan view showing the connecting mechanism between the driving and driven shafts. Fig. 2 represents a side elevation of the same with the gearwheel for adjusting the scroll-disk removed. Fig. 3 represents a cross-section on the line 3 3 shown in Fig. 2. Fig. 4 represents an enlarged end View of the scroll-disk; and Fig. 5 represents a longitudinal section on the line 5 5 in Figs. 1 and 2, showing the driven shaft in elevation.

Similar letters refer to similar parts wher'- ever they occur on the different parts of the drawings.

In the drawings, A represents the continuously-rotating driving-shaft of a motor or power shaft of any kind, and B represents the driven shaft, the speed of which is to be changed independent of the speed of rotation of the drivingshaft A.

To the driving-shaft A is keyed or otherwise secured the disk C, provided with a radial groove D, in which is radially adjusted and guided a block E, and in aperforation in said block is journaled a pin f, to the inner end of which is secured a scroll-disk F, adapted to engage with teeth or projections G G in the bottom of the groove D, as shown in Figs. l, 2, 3, and 4. In one piece with the block E is made a sleeve e, on which is journaled one end of the draw-bar II, as shown. To the outer end of the pin f is secured, preferably, a sprocket-wheel I, which may be connected by means of a sprocket-chain and ahand-operated sprocket-wheel arranged in a convenient place at hand. Instead of a sprocketwheel I may use a spur or bevel gear and suitable corresponding intermediate connecting mechanism. Such connecting mechanism from the gear I is, however, not shown in the drawings, as it does not form a part of myinvention and may be varied at pleasure, according to circumstances. It Will be noticed that by turning said gear I the scroll-disk F will be rotated, and by its engagement with the teeth or rack G in the disk C the said scroll-disk and its shaft or pinf will be caused to move in a radial direction relative to the axis of the driving-shaft A for a purpose as will hereinafter be more fully shown and described.

To the end of the draw-bar H are pivot-ally connected a pair of rods K K', which are pivotally connected at their outer ends, respectively, to disks L L', as shown. Said disks are looselyjournaled on the driven shaft B. To the disk L are secured pivot-pins m m, on which are pivoted levers M M, as shown. On each of said pins fm is also loosely pivoted a forked arm N O, the ends of which are connected to the ends of the lever M by means of yielding springs n o, as shown in Fig. 2.

P is a rod which connects one of the ends of the levers M M, as shown in Fig. 2.

To one end of the upper lever M is attached a rod Q, having a tooth or projection q, adapted to be interlocked and held by a spring R in any one of the locking-recesses 'I U in the locking-plate S, as shown in Fig.2, and by the adjustment of said rod Q the motion impart ed to the shaft B may be reversed.

In the drawings, Figs. 1= 2, and 3, the axis of the crank-pin f is shown as held in a line with the'axis of the drivingshaft A, and during such position the shaft A is free to rotate without imparting any motion to the drawbar H, and consequently no motion is impart ed to the shaft vB.

By turning the wheel I and its shaftf the scroll -disk F by its engagement with the toothed rack G causes the block E to travel in a radial direction in the disk C, thus caus ing the pin f to be held more or less eccentric relative to the axis of the driving-shaft A, and when so adjusted the pin j' causes a reL ciprocatory motion to be imparted to the drawbar H.

During the motion of the draw-bar H in the direction of the arrow shown upon it in Fig. 2 the disk L is caused to be rocked in the di` IOO rection of the arrow shown on it in said Fig. 2, causing the ends N N of the forked arms to impinge against the shaftB by the influence of the springs o 0, thereby imparting a par'- tial rotary motion to a shaft B in the direction of the arrow shown in Fig. 2; During the opposite reciprocating motion of said draw-bar H the ends N N' of the forked arms Will pass freely upon the circumference of the shaft B, while corresponding portions of similar forked arms on the disk L Will impinge against the shaft B by the influence of similar springs, thus imparting a continuous rotary motion from the driving-shaft A to the driven shaft B. By adjusting the position of the rod Q a reverse motion will be imparted to the shaft B from the driving-shaft A, causing the parts O O to be intermittently clamped against the circumference of the shaft B.

The stroke of the draw-bar H and conse- Aquent speed of the shaft B can readily be adfrom the driving-shaft A may readily be advice,consistingin combination a disk, secured to a driving-shaft, there being a radial groove arranged in said disk, and provided with a toothed rack, a scroll-disk, meshing in said rack and journaled in a block, adjustable in said groove, a draw-bar, pivotally connected to said block, rods pivot'ally connected tosaid draw-bar, and disks loosely journaled upon the driven shafuand reversible spring-pressed forked clamping devices pivotally connected to saiddisks, and means for adjusting said scroll-disk, and a reversing device, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES O. JOHNSON.

ALBAN ANDRN, RICHARD C. ULLRICH. 

